supporting science, technology, and improved economic performance and financial literacy in the 21st century. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. after aurora, after virginia tech, after columbine, the question of gun violence becomes a recurring national conversation. this evening, newshour joins pbs in a week of special coverage on the topic of gun violence: "after newtown." the waves of reaction since december's connecticut school shooting continue to reverberate from coast to coast. >> now! ifill: as gun-control activists push for stricter laws. and gun owners chafe against the prospect of new regulation, crossing for... causing for now an increase in sale in firearms and attendance at gun shows. that dpebt is now spreading well beyond washington as cities and states take steps to distance themselves from gun manufacturers. in new york last week, the city school teachers pension fund sold